<!-- TRIGONAL P3 SPACE GROUPS -->
<input type="checkbox" name="spacegroups[]" id="sg_P3" value="P3"> P3<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P31" value="P31"> P31<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P32" value="P32"> P32<br/>
